Photographic slide viewer and projector



Nov. 7, 1950 P. A. SHERWOOD PHOTOGRAPHIC SLIDE VIEWER AND PROJECTOR Filed Nov. 28, 1947 INVENTOR. PLZRLE) A. Jf/ERWOOD ATTORNfKS Patented Nov. 7, 1950 PHOTOGRAPHIC SLIDE VIEWER AND PROJECTOR Perley A. Sherwood, Camden, N. J.

Application November 28, 1947, Serial No. 788,472

- A further object is to provide an improved photographic slide viewer which includes means for viewing an enlarged and illuminated photographic slide interposed between the viewer and the light source, as well as means for projecting a view of said slide onto a screen.

.'A further object is to provide an improved photographic slide viewer and projector which is small in size, light in weight, which is capable of being readily constructed by one skilled in the art at a low cost, and in use. f I

A further object is to provide an improved photographic slide viewer and projector which comprises a novel assembly of demountable parts whereby broken or Worn parts may be readily removed and replaced.

A further object is to provide an improved photographic slide viewer and projector which includes means for mounting the same on any of a plurality of=bases and/or means adapting the viewer to standard slide-viewing equipment.

Other objects and advantages reside in the particular structure of the invention, and/or the several parts thereof, combination and arrangement of such parts, and will be readily understood by those skilled in the art upon reference to the attached drawing in connection with the followings specification, wherein the invention is shown, described and claimed. in the drawing: 1 Figure 1 is a bottom plan view of a preferred form of slide viewer;

Figure 2 is a longitudinal section taken substantially on the plane of the line 2-2 of Figure 4; 1

Figure 3 is a transverse vertical section taken substantially on the plane of the line 33 of Figure 2;

Figure 4 is a front view of the slide viewer;

Figure 5 is an elevation on a reduced scale, parts being broken away and shown in longitudinal vertical section, showin a modified form of the invention;

Figure 6 is an elevation on a reduced scale of a portion of the slide viewer according-to the invention apart from the optical system and which is strong and sturdy 5 Claims. (01. 40-130) 2 showing the mechanism mounted on a suitable base.- I

In the drawing, wherein like reference characters have been used throughout to designate like parts, l0 designates a light socket of known form which includes means such as the prongs l I for readily detachably connecting the same to a source of electric current, The end of the socket l0 opposite the prongs I l is provided with a suitable recess for the reception of an suitable light bulb or source of electric light I2. The forward portion of the socket l0 which provides the mount for the light bulb I2 is of reduced cross-section and preferably cylindrical in form, a at It, and merges with therearward portion of the socket E0 to provide a radially outwardly-directed shoulder l3. The rear portion of the socket I0 is preferably provided with any suitable light switch H).

A substantially cylindrical heat-diffusing housing I6 is provided with a rear inwardly-directed flange I! which terminates in an axial opening I8 which is complementary to the shape of the neck portion M of the socket. A cylindrical side wall of the housing l6 and/or the end flange l1 thereof is formed with a plurality of ventilating openings [9 therein for the rapid dissipation of heat generated by the bulb [2. Thus, the housing I6 is disposed substantially concentrically outwardly of the socket neck I4 and extends forwardly thereof a substantial distance and terminates in straight free edges.

A light housing 20, which is substantially cylindrical in form, is provided at its rear end with a tubular neck 2! which is complementary in cross-section to the cross-section of the neck M of the socket and is slidably received thereon. As is clearly seen in Figure 2, the free inner end edges of the neck or collar 2| of the housing 20 abut against the outer surfaces of the flange I! of the housing l6 and maintain the flange l1 seated against the shoulder I3 of the socket. A-

forward end portion 22 of the housing 20 is radially outwardly offset to provide a substantially annular shoulder 23. The shoulder 23 provides a seat for a mounting ring '24 for a diffusing glass 25. The-router surface "of the offset portion-22 is complementary to the inner surface of the housing -I 6 and provides a seat for the forward free end of the latter. Forwardly of the offset portion 22, the end portion of the housing 20 is again radially outwardly oifset to provide a pair of opposed end flanges 26 and a radially outwardly-directed shoulder 21. The shoulder 21 is preferably substantially rectangular in end view for a purpose to be described later. The rear surface of the flange 21 bears against the free end edges of the housing is to cooperate with the free end edges of the collar 2| to maintain the housing l6 seated against the shoulder |3 of the socket.

A preferably substantially rectangular masking plate 3| is complementary to the interior area defined by the flanges 26 and is adapted to be seated on the outer surface of the shoulder 27. As is readily apparent from Figure 2, the rear surface of the masking plate 3| bears against the forward surface of the diffusing glass 25 and maintains th same seated atop the ring 24.

One of the flanges 26 of the housing 23 is formed to provide an aperture 30, Figure 6, therethrough, to receive a lug 29 formed on a corresponding side edge of the masking plate 21.. Thus, with" the lug 29 inserted through the aperture 33 of the flange 26, on edge, of the masking plate 3| den 21.

A flange 26 oppos te to that provided withthe aperture 30 is provided with an" apertur forthe reception of a threaded machine screw'or' the like 28. The flange 28, which includes th aperture 30,- has its free end formed to provide a plurality of inwardly-directed flanges or'tong'ues 32 for a pur ose to be described later.

The flanges 23 of the housing 2c are adapted to detachably receive a lens system which may cofnprise a substantially cylindrical housing 33 provided at its forward. end with an eye piece 34 which is d"tachably secured, as at 36, to such housing. The eve piece 34 a so preferably seis locked in place against a corresponding shoulcures to th housing 33 any suitable lens or lens' system 35. The rear end" of the hous ng 33 is p'referablv formed to provide a pair of radial y outwardl -onset end flanges 31' which provide rearwardly-directed' and radially outwardly-extendin shoulders 38'. The outer'periphery of the flanges 3'! are preferably complementary to the inner'peripheri s of the flan es 25', whereby the former are s idably received th latter. In. ths osition. Figure 2, the free" end edges ofthe' end flang s 31 bear a ainst the outer or forward surface of the masking p ate 3| to maintain the same seated a ainst th shoulders 2 The tongu s 2 of the end flang s 26 over i the forward portions of one of the shou ders 38 to maintain the housing seated: within the flan es 26 against forward disp acement. The opposite fian e 31 of the hous n 33 is pro ided with an aperture therethrou h which is adapted to align with th correspondin'z'aperture throu h th corresponding flange 26; Fi ures 2 and 3. is formed with an int riorlvthread d a erture therethroughwhich is likewise a ignable with the apertures in the flanges 3'! and 26, whereby to lock said flanges 3'! and 26 together and thereby lock the entire assembly in position on the socket I0. Wh n and if it is d sira e to view a photo raphic s ide without magnification or project on. the housing 33 maybe removed and the nut 39 appli d to lock the masking plate 3| in position. A shoulder 46 of' the housin 33 intermediate the flanges 3'! thereof is formed to provide a pair of rearwardly-directed ton ues or flanges 4| for a purpose to be described. As is apparent in Fi ure 2, the end flanges 3-1 of the member 33 position the shoulders 38 and Q forwardly-spaced relation to the masking plate 3|, whereby to provide a Vertical y-disposed space 42 therebetween which comprises a slideway for the'insertion of a photographic slide, not shown, therein. The flanges 4| provide stops to limit" An eo'neated nut 39,

the movement of the slide in the slideway. whereby the same is properly positioned in front of the masking opening 43 in the masking plate 3|. Such masking plate opening 43 is of any suitable shape, but is preferably cruciform, whereby to successfully disclose a rectangular slide wherein the picture portion thereof is longer in one dimension than in the other. That is to say, such a slide may be successfullyviewed irrespectiv of whether the same is inserted in the slideway right side up or sidewise. As is readily apparent from Figures 3, 4 and 6, at least one of the 'upper corners of each of the shoulders 38, of the housing 33, at least one of the upper corners of the masking plate 3|, and at least one of the' upper corners of the shoulders 21 is cut away, as

at 44, 45' and 43, respectively, whereby to expose the corresponding corner or corners of a photographic slide, not shown,inserted in the slideway 42. With one or both of such upper corners cut awa a'n operator-0f the viewer may'readily grasp the corners .of the: photographic slide. to remove the same from: the slideway.

To assemble the device so'far described, the socket I0 is loaded with a suitable light bulb" I2 and the heat-diffusing housing; IB' is slippedover the 'neck l4 of" the-socket: The light housing is then also slipped over the'h'eck I4 to bear 1 againsttheoutersurfaceof theflange- Thereafter, the-ring 24 isi'seatedagainst the shoulder 23 of the light housin and the diffusing glass is applied atop the ring- 24.-- The: masking plate 3| may-now be applied by inserting the lug-2'9 thereof through the opening in: the' flange 26 and swinging the opposite side: edge of the masking'. plateagainst the outer surface ofthe: sh'oulf der" 21-. If the housing? 33 is not to be used-",- the nut 39 now applid an'dl threaded into place by the screw 28. This arrangement locks the: opposite edge of the masking plate 3| againstith opposite" shoulder 21 and maintains the parts in assembled. relation; If the" housing: 33- or the like is to be usedmieofi the; flanges 3!- and shoul d'ers 38 are inserted. beneath'thelugs 32 of the flange 26, and the opposite flange 31 is seated against the outer surface or the masking: late 3 I The: nut 39 is now'applied and screwed placel- In this connection, it is well terrier-inert that by prbVidifigfllfielongated fill-1?; STICK as shown in 3,4711?! samemayibe' dr'dpp''d' down-the sl idewayfl and maneuvered by fingers at the opposite ends 'ofthe-flange 3! toproperly position the aperture of thniit alignment with-the aperture for the screw 28 In the use' of the device as hereinbefore d escribed, a suitable photographic slide; not'sh-own, is inserted in the slideway 42 011 top of the lugs 4|. The light is now turned onand the user or the viewer by looking through the Tens 3'5 'i n -a well knownmanner sees an enlarged illuminated View of the photographicscenecarried by the slide. To a limited extent, this form of their;- vention may be used as a p'roj'ector,"wherebythe image of the photographic slide is projected through the lens onto a suitable screen not shown. As this form of the invention--provides no means for focusing the lens 35, it is necessaryto move the vi'ew'er as a 'whole'backwardsor'forw'a'rd relative to the screentoachieve a proper focus.

In the form of the invention disclosed in ure 5, the structureofthe socket |0,heat -diffus ing housing l3 and eye piece 34 is substantially identical to the corresponding parts previously described. However, the" rear end of the" housing l'3'3 and/or the f orwar'd end-*- or the li'ghthou'slil'g ilj are -,siiitably modified .toprovide therebe tween a "suitable elongated housing. 52. which-fi's formed with an interior channel 53 to'receive any suitable photographic slide carrier, not shown. Also, such housing 52 is preferably pivoted on suitable trunnions 54 to the upper free ends of the legs of a yoke member which is supported pivotally, as at 55, atop a suitable base 50. In this form of the invention, it is obvious that the pivotal joint 55, together with the trunnions --54, provide a universal, mount for the viewer, whereby the same mayv beturnedin any d ctijon ,to permit successive viewing by aj'pIurality' of people seated'around the base 50, and/or to project the slide onto a suitable screen.

In the form of the invention disclosed by Figure 6, a suitable base 56 is provided and is connected, as by the wire 51, to a suitable source of electric current. The base 56 is preferably formed with a forwardly-inclined face 58 which includes a convenience outlet for electricity from the wire 51. The convenience outlet, not shown, is adapted to receive the prongs II of the socket ID in a well known manner. In this form of the invention, the base 56 is preferably seated on a table with the forward face 58 facing the user of the viewer, whereby the eye piece 34 and housing 33, not shown, extend forwardly at an angle convenient for the viewing of slides.

While I have shown and described what is now thought to be the preferred embodiment of the invention, it is to be understood that the same is susceptible of other forms and expressions. Consequently, I do not limit myself to the precise structure shown and described hereinabove except as hereinafter claimed.

I claim:

1. In a photographic slide viewer, thecombination with an electric light socket, a diffusing glass, a masking plate, and a viewing lens housing; of a hollow and substantially cylindrical light housing, means mounting said light-housing concentrically on said socket with the forward end of said light-housing extending forwardly thereof, a forward end portion of said light-housing being radially outwardly-offset to provide an annular shoulder adapted to seat said diffusing glass, a further forward end portion of said light-housing being radially outwardly offset to provide a substantially rectangular shoulder and end flange adapted to receive said masking plate, said end flange being formed to provide an aperture therethrough, said masking plate being formed with a laterally-directed lug insertable through said aperture to secure one side of said masking plate against said second shoulder, said end flange including means for mounting said viewing lens housing therein in outwardly-spaced relation to said masking plate to provide a slideway therebetween, and detachable means carried by said light-housing for securing an opposite side of said plate and said viewing lens housing to said end flange.

2. In a photographic slide viewer, the combination with an electric light socket, a diffusing glass, and a masking plate; of a hollow and substantially cylindrical light housing, means mounting said light-housing concentrically on said socket with the forward end of said light-housing extending forwardly thereof, a forward end portion of said light-housing being formed to provide means mounting said diffusing glass and said masking plate in superposed relation on a forward end portion of said light housing, a

heat-diffusing housing surrounding said light housin said heat diffusing housin including a front edge and a radially inwardly directed annularrear flange, and said light housing including "arear edge seating on said flange of said heat diffusing housing and a radially outwardly directed shoulder bearing on said front edge of said heat diffusing housing, whereby to mount the latter onsaid socket against axial movement relative to said light housing and said socket.

3 3. In a photographic slide viewer, the combination with an electric light socket, a diffusing glass, a masking plate, and a viewing lens housing; of a hollow and substantially cylindrical light-housing, means mounting said housing concentrically on said socket with the forward end of said light-housing extending forwardly thereof, a forward end portion of said lighthousing being radially outwardly offset to provide an annular shoulder adapted to seat said diffusing glass, a further forward end portion of said light-housing being radially outwardly offset to provide a substantially rectangular shoulder and end flange adapted to receive said masking plate, said end flange being formed to provide an aperture therethrough, said masking plate being formed with a laterally-directed lug insertable through said aperture to secure one side of said masking plate against said second shoulder, said end flange including means for mounting said viewing lens housing therein in outwardly-spaced relation to said masking plate to provide a slideway therebetween, detachable means carried by said light-housing for securing an opposite side of said plate and said viewing lens housing to said end flange, said viewing lens housing including a substantially rectangular base coextensive with said rectangular shoulder, said masking plate being substantially rectangular and coextensive with said rectangular flange, and adjacent corners of said rectangular shoulder, masking plate and base of said viewing housing being cut away and adapted to expose at least one corner of a photographic slide seated in said slideway.

4. In a photographic slide viewer, an electric light socket having a cylindrical mount for the reception of a light bulb, a heat diffusing housing having one end circumposed about said mount and slidably supported thereon, a hollow light housing disposed within said heat diffusing housing and having one end slidably supported on said mount and abutting said one end of said heat diffusing housing, the other end of said light housing being bent outwardly to overlie and abut the other end of said heat diffusing housing, a diffusing glass'supported within said light housing adjacent to said other end thereof, a pair of opposed end flanges extending from said other end of said light housing, a masking plate positioned in alignment with said diffusing plate and supported between said opposed end flanges, a lens housing including a viewing lens arranged in alignment with said masking plate and spaced therefrom, and securing means extending through one of said end flanges and said lens housing for securing the latter to said light housing.

5. In a photographic slide viewer, an electric light socket having a cylindrical mount for the reception of a light bulb, a heat diffusing housing having one end circumposed about said mount and slidably supported thereon, a hollow light housing disposed within said heat diffusing housing and having one end slidably supported on said mount and abutting said one end of said Heat diffusing i'rousih g, the otfier 'fi'd -r=-=sai Iigl'lt Housing" being? bent" outwardly fanifli and abut the"othr"e1id of said; hat'dififisiri g Housing, a diffusing glass supported Wfthifissfi lighb' housing adjacent to said othererid-thefeof' apairof opposed end flanges extending from siaid' other end of said light housing, a maskingplgfil pbsitibned' in alignmer'irr witlr'saiid diffusing plat ands 'upported between-said Oppose'derid fia'nges'; Find lens' means positioned in spaced aligrgmnt with-said masking plate and supporo'e'dlbetween siatidopposedf'fian'ges' fcnf viewing slides-dfspo'seci PERLEY A.. SHERWQGD:

REFERENCES CIT-ED m Number" .Nzfirri-e D'at'e' v Piep'er'et a1. June 2, i931 .Sparling May16';

Leskin' Dec, 12; 194% 

